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Occupational Magnetic Fields and Female Breast Cancer: A Case-Control Study using Swedish Population Registers and New Exposure Data

Several recent epidemiologic studies on occupational magnetic field exposure have suggested an association with female breast cancer. The purpose of this study was to test this hypothesis by using the extensive Swedish population registers in combination with improved exposure assessment. The study...

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Published in:American journal of epidemiology 2005-02, Vol.161 (3), p.250-259
Main Authors: Forssén, Ulla M., Rutqvist, Lars Erik, Ahlbom, Anders, Feychting, Maria
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creator Forssén, Ulla M.
Rutqvist, Lars Erik
Ahlbom, Anders
Feychting, Maria
description Several recent epidemiologic studies on occupational magnetic field exposure have suggested an association with female breast cancer. The purpose of this study was to test this hypothesis by using the extensive Swedish population registers in combination with improved exposure assessment. The study base consisted of all women between 1976 and 1999 gainfully employed in Stockholm or Gotland County in Sweden. A total of 20,400 cases of breast cancer were identified from the cancer registry, and 116,227 controls were selected randomly from the study base. Information was available on estrogen receptor status, occupation, socioeconomic status, and age. Parity was available for a subset. The exposure was assessed by linkage to a newly developed job-exposure matrix based on personal magnetic field measurements on women. All risk estimates were close to unity regardless of exposure cutpoint or choice of exposure parameter. The overall odds ratio for women exposed to 0.30 µT or more was 1.01 (95% confidence interval: 0.93, 1.10). The size of the study allowed for estimates with good precision also in subgroups where previous studies have suggested increased risk, but the findings do not support the hypothesis that magnetic fields influence the risk of female breast cancer.
doi_str_mv 10.1093/aje/kwi041
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J. Epidemiol</addtitle><description>Several recent epidemiologic studies on occupational magnetic field exposure have suggested an association with female breast cancer. The purpose of this study was to test this hypothesis by using the extensive Swedish population registers in combination with improved exposure assessment. The study base consisted of all women between 1976 and 1999 gainfully employed in Stockholm or Gotland County in Sweden. A total of 20,400 cases of breast cancer were identified from the cancer registry, and 116,227 controls were selected randomly from the study base. Information was available on estrogen receptor status, occupation, socioeconomic status, and age. Parity was available for a subset. The exposure was assessed by linkage to a newly developed job-exposure matrix based on personal magnetic field measurements on women. All risk estimates were close to unity regardless of exposure cutpoint or choice of exposure parameter. 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Health state</subject><subject>Biological and medical sciences</subject><subject>Breast cancer</subject><subject>breast neoplasms</subject><subject>Breast Neoplasms - epidemiology</subject><subject>Breast Neoplasms - etiology</subject><subject>Case-Control Studies</subject><subject>confidence interval</subject><subject>Confounding Factors (Epidemiology)</subject><subject>electromagnetic fields</subject><subject>Electromagnetic Fields - adverse effects</subject><subject>Epidemiology</subject><subject>estrogen</subject><subject>Female</subject><subject>General aspects</subject><subject>Gynecology. Andrology. 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source Oxford Journals Online
subjects Adult
Analysis. Health state
Biological and medical sciences
Breast cancer
breast neoplasms
Breast Neoplasms - epidemiology
Breast Neoplasms - etiology
Case-Control Studies
confidence interval
Confounding Factors (Epidemiology)
electromagnetic fields
Electromagnetic Fields - adverse effects
Epidemiology
estrogen
Female
General aspects
Gynecology. Andrology. Obstetrics
Humans
Logistic Models
Magnetic fields
Mammary gland diseases
Medical sciences
Medicin och hälsovetenskap
Middle Aged
Occupational Exposure - adverse effects
Occupational hazards
Parity
Public health. Hygiene
Public health. Hygiene-occupational medicine
receptors
Registries
Risk Factors
Social Class
Sweden - epidemiology
Tumors
title Occupational Magnetic Fields and Female Breast Cancer: A Case-Control Study using Swedish Population Registers and New Exposure Data
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